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https://github.com/FFmpeg/FFmpeg.git
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88 lines
3.0 KiB
C
88 lines
3.0 KiB
C
/*
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* MPEG-1/2 common code
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* Copyright (c) 2007 Aurelien Jacobs <aurel@gnuage.org>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_MPEG12_H
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#define AVCODEC_MPEG12_H
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#include "mpeg12vlc.h"
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#include "mpegvideo.h"
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/* Start codes. */
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#define SEQ_END_CODE 0x000001b7
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#define SEQ_START_CODE 0x000001b3
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#define GOP_START_CODE 0x000001b8
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#define PICTURE_START_CODE 0x00000100
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#define SLICE_MIN_START_CODE 0x00000101
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#define SLICE_MAX_START_CODE 0x000001af
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#define EXT_START_CODE 0x000001b5
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#define USER_START_CODE 0x000001b2
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void ff_mpeg12_common_init(MpegEncContext *s);
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#define INIT_2D_VLC_RL(rl, static_size, flags)\
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{\
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static RL_VLC_ELEM rl_vlc_table[static_size];\
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rl.rl_vlc[0] = rl_vlc_table;\
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ff_init_2d_vlc_rl(&rl, static_size, flags);\
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}
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void ff_init_2d_vlc_rl(RLTable *rl, unsigned static_size, int flags);
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void ff_mpeg1_init_uni_ac_vlc(const RLTable *rl, uint8_t *uni_ac_vlc_len);
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static inline int decode_dc(GetBitContext *gb, int component)
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{
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int code, diff;
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if (component == 0) {
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code = get_vlc2(gb, ff_dc_lum_vlc.table, DC_VLC_BITS, 2);
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} else {
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code = get_vlc2(gb, ff_dc_chroma_vlc.table, DC_VLC_BITS, 2);
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}
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if (code == 0) {
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diff = 0;
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} else {
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diff = get_xbits(gb, code);
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}
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return diff;
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}
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int ff_mpeg1_decode_block_intra(GetBitContext *gb,
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const uint16_t *quant_matrix,
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uint8_t *const scantable, int last_dc[3],
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int16_t *block, int index, int qscale);
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void ff_mpeg1_clean_buffers(MpegEncContext *s);
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#if FF_API_FLAG_TRUNCATED
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int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s);
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#endif
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void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number);
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void ff_mpeg1_encode_mb(MpegEncContext *s, int16_t block[8][64],
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int motion_x, int motion_y);
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void ff_mpeg1_encode_init(MpegEncContext *s);
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void ff_mpeg1_encode_slice_header(MpegEncContext *s);
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void ff_mpeg12_find_best_frame_rate(AVRational frame_rate,
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int *code, int *ext_n, int *ext_d,
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int nonstandard);
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#endif /* AVCODEC_MPEG12_H */
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